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Schematics of various droplet-based microfluidic designs used in various works, including (a–e) the cross-flow, (f,g) the co-flow, and (h–j) the flow-focusing, are shown. Here the fluid in blue color stands for the magnetic materials used for creating the magnetic particles, and the red arrows depict the direction of the continuous phase flow. In (e), two dispersed phases form (blue and orange).
